Design and performance investigation of a multi-pinhole collimator for a small field of view gamma imaging system

Jaekeon Bae, Seungbin Bae, Kisung Lee, Yong Choi, Yongkwon Kim, Jinhun Joung

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The aim of this study is to design a collimator for a gamma imaging system that has a small-footprint, a fast-scan-time, and a organ-specific applicability. To achieve such features, the collimator must have a high resolution, a high sensitivity, and a gantry with a simple geometry. For ensuring high resolution and high sensitivity, we designed a multi-pinhole collimator. For realizing a simplified gantry, we carried out studies with limited angle reconstruction. On the designed multipinhole collimator has eight-pinholes, whose diameters are 2 mm. Limited-angle reconstruction has been conducted with angle intervals of 3, 6, 9, and 12° and with an angle coverage of 60, 90, 120, 150, and 180°. The reconstruction of an image was separately developed based on the ray-driven and voxel-driven methods in order to overcome the sampling problem and to reduce the amount of computation required. To evaluate the performance of the designed system, performed studies on three spherical phantoms and a heart phantom by using the Geant4 application for tomographic emission (GATE) simulation tool. The results showed that the full width at half maximum (FWHM) of the center source were 6.25 mm and 7.18 mm for single-pinhole and multi-pinhole collimators, respectively. Moreover, limited angle reconstruction resulted in a higher efficiency of the imaging system because it overcame the limitation of the gantry geometry. Limited-angle reconstruction was optimized at an angle coverage of 120° with an angle interval of 6°, then reconstructed image was shown a 12.18 mm FWHM. This suggests that the designed system needs only one-third the number of projections to acquire a reconstructed image with a slight degradation in image quality. This also suggests that our proposed multi-pinhole collimator is suitable for applications requiring a small-footprint, a fast-scan-time, and organ-specificity.

Original languageEnglish
Pages (from-to)970-975
Number of pages6
JournalJournal of the Korean Physical Society
Volume64
Issue number7
DOIs
Publication statusPublished - 2014 Jan 1

Fingerprint

pinholes
collimators
field of view
gantry cranes
footprints
organs
intervals
sensitivity
high resolution
geometry
rays
projection
sampling
degradation

Keywords

  • Limited angle system
  • Multi-pinhole collimator
  • Nuclear medicine

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Design and performance investigation of a multi-pinhole collimator for a small field of view gamma imaging system. / Bae, Jaekeon; Bae, Seungbin; Lee, Kisung; Choi, Yong; Kim, Yongkwon; Joung, Jinhun.

In: Journal of the Korean Physical Society, Vol. 64, No. 7, 01.01.2014, p. 970-975.

Research output: Contribution to journalArticle

Bae, Jaekeon ; Bae, Seungbin ; Lee, Kisung ; Choi, Yong ; Kim, Yongkwon ; Joung, Jinhun. / Design and performance investigation of a multi-pinhole collimator for a small field of view gamma imaging system. In: Journal of the Korean Physical Society. 2014 ; Vol. 64, No. 7. pp. 970-975.
@article{f15cc40c4fd8421d810db8a1a216fdfd,
title = "Design and performance investigation of a multi-pinhole collimator for a small field of view gamma imaging system",
abstract = "The aim of this study is to design a collimator for a gamma imaging system that has a small-footprint, a fast-scan-time, and a organ-specific applicability. To achieve such features, the collimator must have a high resolution, a high sensitivity, and a gantry with a simple geometry. For ensuring high resolution and high sensitivity, we designed a multi-pinhole collimator. For realizing a simplified gantry, we carried out studies with limited angle reconstruction. On the designed multipinhole collimator has eight-pinholes, whose diameters are 2 mm. Limited-angle reconstruction has been conducted with angle intervals of 3, 6, 9, and 12° and with an angle coverage of 60, 90, 120, 150, and 180°. The reconstruction of an image was separately developed based on the ray-driven and voxel-driven methods in order to overcome the sampling problem and to reduce the amount of computation required. To evaluate the performance of the designed system, performed studies on three spherical phantoms and a heart phantom by using the Geant4 application for tomographic emission (GATE) simulation tool. The results showed that the full width at half maximum (FWHM) of the center source were 6.25 mm and 7.18 mm for single-pinhole and multi-pinhole collimators, respectively. Moreover, limited angle reconstruction resulted in a higher efficiency of the imaging system because it overcame the limitation of the gantry geometry. Limited-angle reconstruction was optimized at an angle coverage of 120° with an angle interval of 6°, then reconstructed image was shown a 12.18 mm FWHM. This suggests that the designed system needs only one-third the number of projections to acquire a reconstructed image with a slight degradation in image quality. This also suggests that our proposed multi-pinhole collimator is suitable for applications requiring a small-footprint, a fast-scan-time, and organ-specificity.",
keywords = "Limited angle system, Multi-pinhole collimator, Nuclear medicine",
author = "Jaekeon Bae and Seungbin Bae and Kisung Lee and Yong Choi and Yongkwon Kim and Jinhun Joung",
year = "2014",
month = "1",
day = "1",
doi = "10.3938/jkps.64.970",
language = "English",
volume = "64",
pages = "970--975",
journal = "Journal of the Korean Physical Society",
issn = "0374-4884",
publisher = "Korean Physical Society",
number = "7",

}

TY - JOUR

T1 - Design and performance investigation of a multi-pinhole collimator for a small field of view gamma imaging system

AU - Bae, Jaekeon

AU - Bae, Seungbin

AU - Lee, Kisung

AU - Choi, Yong

AU - Kim, Yongkwon

AU - Joung, Jinhun

PY - 2014/1/1

Y1 - 2014/1/1

N2 - The aim of this study is to design a collimator for a gamma imaging system that has a small-footprint, a fast-scan-time, and a organ-specific applicability. To achieve such features, the collimator must have a high resolution, a high sensitivity, and a gantry with a simple geometry. For ensuring high resolution and high sensitivity, we designed a multi-pinhole collimator. For realizing a simplified gantry, we carried out studies with limited angle reconstruction. On the designed multipinhole collimator has eight-pinholes, whose diameters are 2 mm. Limited-angle reconstruction has been conducted with angle intervals of 3, 6, 9, and 12° and with an angle coverage of 60, 90, 120, 150, and 180°. The reconstruction of an image was separately developed based on the ray-driven and voxel-driven methods in order to overcome the sampling problem and to reduce the amount of computation required. To evaluate the performance of the designed system, performed studies on three spherical phantoms and a heart phantom by using the Geant4 application for tomographic emission (GATE) simulation tool. The results showed that the full width at half maximum (FWHM) of the center source were 6.25 mm and 7.18 mm for single-pinhole and multi-pinhole collimators, respectively. Moreover, limited angle reconstruction resulted in a higher efficiency of the imaging system because it overcame the limitation of the gantry geometry. Limited-angle reconstruction was optimized at an angle coverage of 120° with an angle interval of 6°, then reconstructed image was shown a 12.18 mm FWHM. This suggests that the designed system needs only one-third the number of projections to acquire a reconstructed image with a slight degradation in image quality. This also suggests that our proposed multi-pinhole collimator is suitable for applications requiring a small-footprint, a fast-scan-time, and organ-specificity.

AB - The aim of this study is to design a collimator for a gamma imaging system that has a small-footprint, a fast-scan-time, and a organ-specific applicability. To achieve such features, the collimator must have a high resolution, a high sensitivity, and a gantry with a simple geometry. For ensuring high resolution and high sensitivity, we designed a multi-pinhole collimator. For realizing a simplified gantry, we carried out studies with limited angle reconstruction. On the designed multipinhole collimator has eight-pinholes, whose diameters are 2 mm. Limited-angle reconstruction has been conducted with angle intervals of 3, 6, 9, and 12° and with an angle coverage of 60, 90, 120, 150, and 180°. The reconstruction of an image was separately developed based on the ray-driven and voxel-driven methods in order to overcome the sampling problem and to reduce the amount of computation required. To evaluate the performance of the designed system, performed studies on three spherical phantoms and a heart phantom by using the Geant4 application for tomographic emission (GATE) simulation tool. The results showed that the full width at half maximum (FWHM) of the center source were 6.25 mm and 7.18 mm for single-pinhole and multi-pinhole collimators, respectively. Moreover, limited angle reconstruction resulted in a higher efficiency of the imaging system because it overcame the limitation of the gantry geometry. Limited-angle reconstruction was optimized at an angle coverage of 120° with an angle interval of 6°, then reconstructed image was shown a 12.18 mm FWHM. This suggests that the designed system needs only one-third the number of projections to acquire a reconstructed image with a slight degradation in image quality. This also suggests that our proposed multi-pinhole collimator is suitable for applications requiring a small-footprint, a fast-scan-time, and organ-specificity.

KW - Limited angle system

KW - Multi-pinhole collimator

KW - Nuclear medicine

UR - http://www.scopus.com/inward/record.url?scp=84899143527&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84899143527&partnerID=8YFLogxK

U2 - 10.3938/jkps.64.970

DO - 10.3938/jkps.64.970

M3 - Article

AN - SCOPUS:84899143527

VL - 64

SP - 970

EP - 975

JO - Journal of the Korean Physical Society

JF - Journal of the Korean Physical Society

SN - 0374-4884

IS - 7

ER -